Why is the progress bar on the Video Controls palette always moving? It never becomes a solid block, is this correct?

Technical Note: 244
Reads: 5800
Creation Date: 14/09/2001
Modification Date: 12/02/2004

For most cameras the progress bar can be used when viewing the live signal as an approximate indication of when to expect the next frame to be shown on the screen. The solid block moves from left to right across the bottom of the palette. However this feature relies on Openlab being able to obtain information from the camera about how much progress has been made. For some cameras this information is not available and then Openlab displays the striped progress bar to indicate that indeterminate progress has been made.